Sensitivity Analysis Of The Physical Parameters To The Seismic Response Of Loess Slopes

Currently seismic dynamic stability of slope is one of the focuses in theengineering geology research. Loess slope distribution is very extensive in China andalmost distributed in the seismic belt. Therefore slopes are highly susceptible to theinfluence of seismic load. So it leads to geological disasters such as landslide, collapse.From the point of view of geological disaster research, the physical parameters areprone condition of slope to the seismic geological disaster. And they are importantfactors to the earthquake dynamic response and stability of the slope. Hence, theresearch of main parameters sensitivity analsis to seismic dynamic response of slopeis one of the key problems of slope seismic dynamic analysis.So far, the analysis andresearch of loess physical parameters influence on the stability of the seismic dynamicslope is still less.This article selects the Panlongyuan slope in Baoji city Shanxi province to carryout the sensitivity research, and it is concluded the physical parameters sensitivity onseismic dynamic response effects of loess slope.Based on characteristics of the loessslope and the slope deformation failure type under the action of earthquake and failuremechanism research, we identified to study the loess physical parameters are: densityρ, young’s modulus E and Poisson ratio μ, critical damping ratio D, cohesion c andinternal friction angle φ. This paper simplifies the slope into three layers ofhomogeneous continuum. Loess parameters are grouped by the method of orthogonaldesign, and we use FLAC3Dsoftware to simulate experiments. Then the simulationresults are taken to making range analysis and variance analysis to get the loessparameter sensitivity degree in different type of seismic dynamic action.This articlemain research content is as follows:In the condition of micro earthquakes, the parameter sensitivity research arecarried out in different types of seismic wave that are vertical incident at the bottom ofthe slope, and it gets the sequence of parameter sensitivity as well as provides ascientific basis for slope basic frequency inversion. The sequence is Poisson’s ratio>young’s modulus> critical damping ratio> density.It also lays the foundation for the study of slope stability under macro earthquake accurately.Under the macro earthquake condition, the parameter sensitivity is studied indifferent types of seismic wave that are incident at the bottom of the slope in thevertical and oblique ways. Parameter sensitivity sequence is: critical damping ratio>internal friction Angle> cohesion> poisson’s ratio> the young’s modulus>density.The most unfavorable parameter combination and the slope failure mode areobtained.Through the study of the sensitivity analysis of loess parameters, this paperconcludes the trend figures of the slope dynamic response which parameters change ina reasonable range.